cement board corners
Tiling standards say to tape and thinset all seams. The exception is the wall to floor/shower base/tub deck. That calls for a 1/4" gap.
Densguard (or Densarmor) is a tile backer.
Denshield is a paperless drywall.
All Kerdi seams are to be overlapped by 2" or covered with Kerdi-Band. Kerdi is installed using a non-modified thinset.
After tiling, use silicone in all plane changes; corners, wall to floor/ceiling.
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